I remember seeing a notice board that says no entry to campsite after 10pm But it may have changed, so please confirm by calling them.
They do keep a good site there. Patrols are more frequent at night, but, it is a wonderful place to camp, and the gate only closes when the park does.
The gates never close on people that are camping but you do need to pay to use campsites.
We did not experience a closed gate while we were there. Patrols did increase at night, however.
Thanks! Your answer is awaiting moderation.